CVE-2026-97787

Microsoft Windows 11 23h2: race condition

Risk score: 54/100
CVSS: 7.0 v3.1
Exploit chance (30 days): 0.2%
Published: 13 Oct 2026

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What to know

What it is: Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.
Affected: Microsoft Windows 11 23h2
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: No known exploitation

Why it is Yellow

CVSS 7.0 high
On your watchlist: windows server

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97787

Original description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

Last activity 13 Oct 2026. Patch Forecast updates every hour.